The effect of CO on CO2-char gasification

Zheng, Yaoyao; Marek, Ewa; Scott, Stuart A.

Abstract

The effect of CO on the gasification of a Polish coal-derived char was studied in a fluidized bed from 1123 K to 1248 K. Rate expressions developed from Ergun’s mechanism or a modified three-step reaction mechanism, coupled with Cylindrical Pore Interpolation Model to account for the intra-particle mass transfer, were developed to predict gasification and the effect of CO. Compared to the Ergun’s rate expression, the three-step expression had an extra term for pco , making the inhibition effect of CO more pronounced. The agreement between experimental and numerical results was satisfactory for both models simulating gasification by CO2/N2. When CO (1% or 3%) was intentionally introduced in the feed gas (CO2/N2), the gasification rates significantly decreased. The model based on Ergun’s mechanism over-estimated the gasification rate, while the results from the model with the three-step mechanism agreed with the experimental data.

Citation

Zheng, Y., Marek, E., & Scott, S. A. The effect of CO on CO2-char gasification

• Presentation Conference Type: Conference Paper (published)
• Acceptance Date: Jun 11, 2020
• Online Publication Date: Sep 9, 2020
• Publication Date: Apr 10, 2021
• Deposit Date: Apr 3, 2024
• Journal: Proceedings of the Combustion Institute
• Print ISSN: 1540-7489
• Electronic ISSN: 1540-7489
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 38
• Issue: 3
• Pages: 4261-4269
• DOI: https://doi.org/10.1016/j.proci.2020.06.245
• Public URL: https://nottingham-repository.worktribe.com/output/32757532
• Publisher URL: https://www.sciencedirect.com/science/article/abs/pii/S1540748920303370?via%3Dihub